The Construction Master IV® is a hand-held construction math calculator. It solves calculations and delivers solutions in conformance to construction code, says the company. Designed for contractors and other construction professionals, the unit calculates area, volume, right angles, rafter, framing, and stair solutions. It also works as a regular calculator. It comes with a user’s guide, protective carrying case, and battery. Seton Identification Products, attn: Donna Canestri, Dept. YOQ, P.O. Box 819, Branford, CT 06405-0819; 800-243-6624; 800-345-7819 (fax); (Web site).